@article{CC_2009_38_4B_a1,
     author = {Dontchev, Asen L. and Veliov, Vladimir M.},
     title = {Metric regularity under approximations},
     journal = {Control and Cybernetics},
     pages = {1283--1303},
     publisher = {mathdoc},
     volume = {38},
     number = {4B},
     year = {2009},
     zbl = {1236.49071},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2009_38_4B_a1/}
}